postgresql

问题 I'm trying to convert the column, and preserve the data in the specified timezone. I have a script, but it errors out on the SELECT at the end. ALTER TABLE schema.table ALTER COLUMN column_date TYPE TIMESTAMP WITH TIME ZONE USING column_date AT TIME ZONE (SELECT value FROM schema.table WHERE id = 'timezone'); ERROR: cannot use subquery in transform expression I have time zones stored, but trying to pull that back to apply to the script is posing a challenge. I know I can simply hardcode the

问题 I'm trying to convert the column, and preserve the data in the specified timezone. I have a script, but it errors out on the SELECT at the end. ALTER TABLE schema.table ALTER COLUMN column_date TYPE TIMESTAMP WITH TIME ZONE USING column_date AT TIME ZONE (SELECT value FROM schema.table WHERE id = 'timezone'); ERROR: cannot use subquery in transform expression I have time zones stored, but trying to pull that back to apply to the script is posing a challenge. I know I can simply hardcode the

问题 New to python, trying to use psycopg2 to read Postgres I am reading from a database table called deployment and trying to handle a Value from a table with three fields id, Key and Value import psycopg2 conn = psycopg2.connect(host="localhost",database=database, user=user, password=password) cur = conn.cursor() cur.execute("SELECT \"Value\" FROM deployment WHERE (\"Key\" = 'DUMPLOCATION')") records = cur.fetchall() print(json.dumps(records)) [["newdrive"]] I want this to be just "newdrive" so

问题 I want to insert geoJSON to a geometry column of a table. I have already inserted CSV file to the same column following this tutorial, I wonder how to insert the geoJSON to any geometry column? I tried following this answer but could not get what is going on there. 回答1: Just use an update with the function ST_GeomFromGeoJSON: UPDATE mytable SET geom = ST_GeomFromGeoJSON(json_column); The following example inserts a GeoJSON point into a JSON column and afterwards updates the geometry column

问题 I have a problem connecting my Postgres database to django project on docker container. I have already tried every solution found on the internet and nothing seems to work. I've already added host all all all md5 to my pg_hba.conf file, listen_addresses = '*' to postgresql.conf. Here is log from lsof -i :5432: postgres 19774 postgres 5u IPv4 2046377 0t0 TCP *:postgresql (LISTEN) postgres 19774 postgres 6u IPv6 2046378 0t0 TCP *:postgresql (LISTEN) I've tried to open 5432 port by using ufw

问题 I've been using a "normal" (non-composite) primary key for one of my tables. Now I want to change it to a composite primary key. My tables look something like this: -- Table 1 CREATE TABLE foo ( id SERIAL PRIMARY KEY, id2 INT, ... ) -- Table 2 CREATE TABLE bar ( id SERIAL PRIMARY KEY, id_foo INT REFERENCES foo (id) ) The problem here is that psql does not want to drop the old primary key, since other tables reference it. Is there any way of getting around this without dropping the whole

问题 My trigger in Oracle looks like this… CREATE OR REPLACE TRIGGER example$example BEFORE UPDATE OR DELETE ON example FOR EACH ROW BEGIN INSERT INTO example$ VALUES ( :old.key, :old.name, :old.describe seq.nextVal ); END; I thought I could simply translate to Postgresql with this… CREATE OR REPLACE TRIGGER example$example BEFORE UPDATE OR DELETE ON example FOR EACH ROW BEGIN INSERT INTO example$ VALUES ( OLD.key, OLD.name, OLD.describe, NEXTVAL('seq') ); END; I'm getting an error at the end of

问题 I currently use Paramiko to access an SFTP server and connect to the PostgreSQL on the same server. I found many examples using sshtunnel to log on PostgreSQL. But I don't know how to do it with pure Paramiko. Currently my code looks something like: # establish SSH tunnel self.ssh = paramiko.SSHClient() self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) self.ssh.connect(hostname=host, username=user, password=password) # setup SFTP server self.sftp = self.ssh.open_sftp() # connect

问题 I have a Heroku PostgreSQL database to which I can't connect from Java. I have tried different methods but without success. Below is my Java code: import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class MainConfig { public static void main(String[] args) { try{ dataSource(); System.out.println("conected"); } catch(Exception ex){ ex.printStackTrace(); } } public static Connection dataSource() throws URISyntaxException, SQLException { String

问题 I have a Heroku PostgreSQL database to which I can't connect from Java. I have tried different methods but without success. Below is my Java code: import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class MainConfig { public static void main(String[] args) { try{ dataSource(); System.out.println("conected"); } catch(Exception ex){ ex.printStackTrace(); } } public static Connection dataSource() throws URISyntaxException, SQLException { String